Subreddits starting with 0–9

Life, culture, and history of the 1920s.

Old School RuneScape.

Free tech support around the clock.

Women's outfits and style inspiration.

Discussion of the TV series 30 Rock.

Bad jokes that are only funny at 3 a.m.

3D modelling: work, help, and tutorials.

3D printing: printers, prints, and help.

Nintendo 3DS games and discussion.

Autodesk 3ds Max help.

San Francisco 49ers fans.

Four-wheel drive and off-roading.

4X strategy games: explore, expand, exploit, exterminate.

A weekly cooking challenge.

Music from the 1980s.

Set a 90-day goal and track it with others.

Nostalgia and culture from the 1990s.

Alternative rock from the 1990s.

Cartoons from the 1990s.

Hip-hop from the 1990s: classic tracks and artists.